Influence of Stir Casting Parameters on the Microstructure and Mechanical Properties of SiC–B₄C Reinforced Al6061 Composites

In the present study, Al6061-based hybrid composites reinforced with silicon carbide (SiC) and boron carbide (B₄C) were fabricated using the stir casting technique to examine the effect of key processing parameters on microstructural features and mechanical behaviour. Stir casting process minimizes agglomeration and porosity while promoting uniform dispersion of SiC and B₄C particles, according to microstructural analysis using scanning electron microscopy. In comparison to the unreinforced Al6061 alloy, mechanical characterisation showed significant increases in hardness up to 72.6 VHN and tensile strength 159.37 MPa. Strong matrix–reinforcement interfacial integrity, efficient load transfer by adding SiC and B₄C reinforcements, and grain refinement are responsible for the improvement in mechanical properties. The results emphasise how important stir casting parameters in Al6061–SiC–B₄C hybrid composites structure–property relationship for possible structural and automotive uses.